To use the modifier keys - Go to Healbot options - Spells tab
Set the "Set Spells for" and "Cast when button" the way you desire...
Then set the spells for each of the 5 Mouse buttons
If you want to use modifier keys - click one of the modifier on (Shift, Ctrl or Alt) and then set each of the mouse keys for the spell to use when using the modifier.
To use more than 5 mouse buttons install Healbot plugin - ExtraButtons
Hope that helps.
Yes there seems to be more ways to use a trinket in a macro than I have had breakfasts. It took me 2 sessions and about 2 hours to get it to work the way I wanted.
Coincidentally, I got that trinket last sunday so I wanted to use it myself. Got it to use the trinket on hbtarget quickly but combining it with a spell was more difficult. Then eliminating the error messages and sounds nearly made me cry (it initially broke the whole macro - finger trouble lol).
The sequence is very important and wont work for all trinkets. Trinket cannot be using Global CD and must be first use/cast, otherwise you will be casting healing spell and trinket use/cast will fail.
I still get a "whoosh" sound when the trinket is in CD but it's not very noticeable and I'm sure I wont hear it at all in combat. I probably should have tidied up the cast to hbtarget but was very over the whole thing and when it worked perfectly I stopped (not wanting to break it again lol).
If you get it neat and tidy post it - The macro will be very useful for this trinket and others with similar characteristics.
PS I hope they dont change macro options with tonight's patch and break it.
You are correct - Water Shield has 3 charges which is not reflected in the tooltip. The older patch notes seem to infer this was not the case and I couldn't find any forum discussion about it. I tested it this morning and the buff certainly disappears after I copped some melee strikes.
However, Healbot will track the Water Shield charges - go to Healbot options - Buffs - Custom - add spell "Water Shield" (id 52127 I think) and it will show on your bars with the count if you have set your buffs that way.
On a side note - I notice that Lightning Shield seems to work the same way but I couldn't get Healbot to track the number of charges. Couldn't be bothered wasting any more time to try and work out why (I might have some settings wrong).