Overlapping Talents and Power-Talents

[Nedorus]

Basic Set Characters B89 specifies that overlapping Talents are cumulative with respect to skill bonuses.

Originally Posted by Characters B89

You may never have more than four levels of a particular Talent. However, overlapping Talents can give skill bonuses (only) in excess of +4.

Additionally GURPS Powers states that a Power-Talent "is similar to a mundane Talent" and then naming explicit differences (not relevant here).

For Context
For my new campaign (Iron Kingdoms Steampunk+Magic setting) I'm designing several distinct Powers (in the GURPS POWERS sense) for players to use.

Two of them are likely to be used in conjunction as both have "gadgets" as their focus. Namely those are Steam-Powered and Mechanika. The former bestows a character with abilities that rely on gadgets driven by steam power (furnace and kettle to produce power) while the latter bestows the character with abilities rooting in the arcane runes inscribed in the gadgets.
Examples:
Steam-Powered Jumping-Boots give the character wearing them the Super-Jump ability (plus modifiers) while the Mechanika powered Night Vision Goggles give the character wearing them the Night Vision advantage (again plus modifiers) etc.

I want to let my players use the appropriate Power-Talent to enhance their (mundane) skill rolls when using those items. E.g. The character using the Jumping Boots would get a Talent-bonus to his jumping skill when using the boot (in addition to the Super-Jump ability). The character using the Night-Vision Goggles would receive a Talent-bonus for his perception roll when trying to spot something in the dark.
This is - I think - in accordance with the way GURPS Powers describes the application of the Power-Talent on P29.

There will be "gadgets" (most notably Steamjacks) that implement / utilize both Powers.
There will also be characters with mundane talents that can be applied in addition to the Power-Talent (e.g. Trained-Athlete wearing the Jumping-Boots).
This could add up to some pretty hefty bonuses.

The Question
Do you think I should allow

1. overlapping of two Power-Talents
2. overlapping of Power-Talent and mundane talent
3. both

Why? / Why not?

[Donny Brook]

I am fairly open to players' custom Talent proposals. To accommodate that, I don't allow the bonus from Talents to stack beyond +4.

[Nedorus]

So despite the fact that B90 clearly lists the "ready-made" Talents as examples and gives a just as clear method to create "custom Talents" you house rule that even mundane* talents do not stack beyond +4?

OK, that is interesting. What's your reasoning for this?

*mundane referring to the talents described on B89/B90 as opposed to the Power Talents from GURPS Powers.

[Donny Brook]

Originally Posted by Nedorus

So despite the fact that B90 clearly lists the "ready-made" Talents as examples and gives a just as clear method to create "custom Talents" you house rule that even mundane* talents do not stack beyond +4?

OK, that is interesting. What's your reasoning for this?

*mundane referring to the talents described on B89/B90 as opposed to the Power Talents from GURPS Powers.

I identified the need when a player proposed a character with three 5-point talents that resulted in a Carousing level that was far too high to suit the campaign.

I don't generally run campaigns where extreme success ratios from hyper-specialization is a particularly good fit.

[Nedorus]

So your player was spending 15 points for a +3 on Carousing? I think I would not feel a need to limit that...
Increasing a skill by +3 would otherwise only cost 8-12 points.
This would only pose a problem for largely overlapping talents (2+ skills in both talents).

But be that as it may, my question was about Power Talents overlapping with "mundane" talents as well as Power talents overlapping with Power Talents.

[Donny Brook]

If I remember right, he had 2 levels in two talents and 1 in the third for a net +5.

Peaking out Carousing was not his objective, it was emergent.

I think I misunderstood what you meant by "both" in your original post. On that, my advice is look out for unintended consequences.